iOS视频添加背景音乐同时保留原音
话不多说，请看代码：
//抽取原视频的音频与需要的音乐混合
-(void)addmusic:(id)sender
{
[MBProgressHUDshowHUDAddedTo:self.viewanimated:YES];
AVMutableComposition*composition=[AVMutableCompositioncomposition];
audioMixParams=[[NSMutableArrayalloc]initWithObjects:nil];
//录制的视频
NSURL*video_inputFileUrl=[NSURLfileURLWithPath:self.videoPath];
AVURLAsset*songAsset=[AVURLAssetURLAssetWithURL:video_inputFileUrloptions:nil];
CMTimestartTime=CMTimeMakeWithSeconds(0,songAsset.duration.timescale);
CMTimetrackDuration=songAsset.duration;
//获取视频中的音频素材
[selfsetUpAndAddAudioAtPath:video_inputFileUrltoComposition:compositionstart:startTimedura:trackDurationoffset:CMTimeMake(14*44100,44100)];
//本地要插入的音乐
NSString*bundleDirectory=[[NSBundlemainBundle]bundlePath];
NSString*path=[bundleDirectorystringByAppendingPathComponent:@"30secs.mp3"];
NSURL*assetURL2=[NSURLfileURLWithPath:path];
//获取设置完的本地音乐素材
[selfsetUpAndAddAudioAtPath:assetURL2toComposition:compositionstart:startTimedura:trackDurationoffset:CMTimeMake(0,44100)];
//创建一个可变的音频混合
AVMutableAudioMix*audioMix=[AVMutableAudioMixaudioMix];
audioMix.inputParameters=[NSArrayarrayWithArray:audioMixParams];//从数组里取出处理后的音频轨道参数
//创建一个输出
AVAssetExportSession*exporter=[[AVAssetExportSessionalloc]
initWithAsset:composition
presetName:AVAssetExportPresetAppleM4A];
exporter.audioMix=audioMix;
exporter.outputFileType=@"com.apple.m4a-audio";
NSString*fileName=[NSStringstringWithFormat:@"%@.mov",@"overMix"];
//输出路径
NSString*exportFile=[NSStringstringWithFormat:@"%@/%@",[selfgetLibarayPath],fileName];
if([[NSFileManagerdefaultManager]fileExistsAtPath:exportFile]){
[[NSFileManagerdefaultManager]removeItemAtPath:exportFileerror:nil];
}
NSLog(@"是否在主线程1%d",[NSThreadisMainThread]);
NSLog(@"输出路径===%@",exportFile);
NSURL*exportURL=[NSURLfileURLWithPath:exportFile];
exporter.outputURL=exportURL;
self.mixURL=exportURL;
[exporterexportAsynchronouslyWithCompletionHandler:^{
intexportStatus=(int)exporter.status;
switch(exportStatus){
caseAVAssetExportSessionStatusFailed:{
NSError*exportError=exporter.error;
NSLog(@"错误，信息:%@",exportError);
[MBProgressHUDhideHUDForView:self.viewanimated:YES];
break;
}
caseAVAssetExportSessionStatusCompleted:{
NSLog(@"是否在主线程2%d",[NSThreadisMainThread]);
NSLog(@"成功");
//最终混合
[selftheVideoWithMixMusic];
break;
}
}
}];
}
//最终音频和视频混合
-(void)theVideoWithMixMusic
{
NSError*error=nil;
NSFileManager*fileMgr=[NSFileManagerdefaultManager];
NSString*documentsDirectory=[NSHomeDirectory()
stringByAppendingPathComponent:@"Documents"];
NSString*videoOutputPath=[documentsDirectorystringByAppendingPathComponent:@"test_output.mp4"];
if([fileMgrremoveItemAtPath:videoOutputPatherror:&error]!=YES){
NSLog(@"无法删除文件，错误信息：%@",[errorlocalizedDescription]);
}
//声音来源路径（最终混合的音频）
NSURL*audio_inputFileUrl=self.mixURL;
//视频来源路径
NSURL*video_inputFileUrl=[NSURLfileURLWithPath:self.videoPath];
//最终合成输出路径
NSString*outputFilePath=[documentsDirectorystringByAppendingPathComponent:@"final_video.mp4"];
NSURL*outputFileUrl=[NSURLfileURLWithPath:outputFilePath];
if([[NSFileManagerdefaultManager]fileExistsAtPath:outputFilePath])
[[NSFileManagerdefaultManager]removeItemAtPath:outputFilePatherror:nil];
CMTimenextClipStartTime=kCMTimeZero;
//创建可变的音频视频组合
AVMutableComposition*mixComposition=[AVMutableCompositioncomposition];
//视频采集
AVURLAsset*videoAsset=[[AVURLAssetalloc]initWithURL:video_inputFileUrloptions:nil];
CMTimeRangevideo_timeRange=CMTimeRangeMake(kCMTimeZero,videoAsset.duration);
AVMutableCompositionTrack*a_compositionVideoTrack=[mixCompositionaddMutableTrackWithMediaType:AVMediaTypeVideopreferredTrackID:kCMPersistentTrackID_Invalid];
[a_compositionVideoTrackinsertTimeRange:video_timeRangeofTrack:[[videoAssettracksWithMediaType:AVMediaTypeVideo]objectAtIndex:0]atTime:nextClipStartTimeerror:nil];
//声音采集
AVURLAsset*audioAsset=[[AVURLAssetalloc]initWithURL:audio_inputFileUrloptions:nil];
CMTimeRangeaudio_timeRange=CMTimeRangeMake(kCMTimeZero,videoAsset.duration);//声音长度截取范围==视频长度
AVMutableCompositionTrack*b_compositionAudioTrack=[mixCompositionaddMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid];
[b_compositionAudioTrackinsertTimeRange:audio_timeRangeofTrack:[[audioAssettracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]atTime:nextClipStartTimeerror:nil];
//创建一个输出
AVAssetExportSession*_assetExport=[[AVAssetExportSessionalloc]initWithAsset:mixCompositionpresetName:AVAssetExportPresetMediumQuality];
_assetExport.outputFileType=AVFileTypeQuickTimeMovie;
_assetExport.outputURL=outputFileUrl;
_assetExport.shouldOptimizeForNetworkUse=YES;
self.theEndVideoURL=outputFileUrl;
[_assetExportexportAsynchronouslyWithCompletionHandler:
^(void){
[MBProgressHUDhideHUDForView:self.viewanimated:YES];
//播放
NSURL*url=[NSURLfileURLWithPath:outputFilePath];
MPMoviePlayerViewController*theMovie=[[MPMoviePlayerViewControlleralloc]initWithContentURL:url];
[selfpresentMoviePlayerViewControllerAnimated:theMovie];
theMovie.moviePlayer.movieSourceType=MPMovieSourceTypeFile;
[theMovie.moviePlayerplay];
}
];
NSLog(@"完成！输出路径==%@",outputFilePath);
}
//通过文件路径建立和添加音频素材
-(void)setUpAndAddAudioAtPath:(NSURL*)assetURLtoComposition:(AVMutableComposition*)compositionstart:(CMTime)startdura:(CMTime)duraoffset:(CMTime)offset{
AVURLAsset*songAsset=[AVURLAssetURLAssetWithURL:assetURLoptions:nil];
AVMutableCompositionTrack*track=[compositionaddMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack*sourceAudioTrack=[[songAssettracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0];
NSError*error=nil;
BOOLok=NO;
CMTimestartTime=start;
CMTimetrackDuration=dura;
CMTimeRangetRange=CMTimeRangeMake(startTime,trackDuration);
//设置音量
//AVMutableAudioMixInputParameters（输入参数可变的音频混合）
//audioMixInputParametersWithTrack（音频混音输入参数与轨道）
AVMutableAudioMixInputParameters*trackMix=[AVMutableAudioMixInputParametersaudioMixInputParametersWithTrack:track];
[trackMixsetVolume:0.8fatTime:startTime];
//素材加入数组
[audioMixParamsaddObject:trackMix];
//Insertaudiointotrack//offsetCMTimeMake(0,44100)
ok=[trackinsertTimeRange:tRangeofTrack:sourceAudioTrackatTime:kCMTimeInvaliderror:&error];
}
#pragmamark-保存路径
-(NSString*)getLibarayPath
{
NSFileManager*fileManager=[NSFileManagerdefaultManager];
NSArray*paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString*path=[pathsobjectAtIndex:0];
NSString*movDirectory=[pathstringByAppendingPathComponent:@"tmpMovMix"];
[fileManagercreateDirectoryAtPath:movDirectorywithIntermediateDirectories:YESattributes:nilerror:nil];
returnmovDirectory;
}
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